Ultrasonic cleaning of case with crystal in situ

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I occasionally give some of my watches an ultrasonic to get the grime out of nooks and crannies. Usually I strip the case down, so bracelet off, case back off, movement/dial out, bezel off if applicable and crystal out.

However, today I was wondering, is this necessary? Can I put the midcase in the ultrasonic without removing the crystal (assume 60’s plexi/hesalite) or is there a risk of the hesalite fracturing?

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